Nut-lock.



No. 789,587. PATENTED MAY 9, 1905.

J. H. BURROWS.

NUT LOOK.

APPLIOATION FILED JAN. 14, 1905.

Wzime1s@e@ m I n van for. 16w @r Jolsqpi bflflurrowa l mzzfaw. 19 1 by 21% M ltluifnn Patented May 9, 1905.

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JOSEPH lI. BURROlVS, OF BOSTON, MASSACHUSETIS, ASSIUNOR TO AMER].- (JAN LOCK NU" COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 789,587, dated May 9, 1905.

Application filed January 14, 1905. Serial No. 241,062.

To (I/ZZ/ whont it may concern/.-

Be it known that l, Josuru H. Bunuows, a citizen of the United States, and a resident of Boston, county of Suffolk, and State of Massachusetts, have invented an improvement in Nut-Locks, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

My invention relates to an improvement in nut-locks; and the purpose of the invention is to provide a simple, durable, and economic form of nut-lock which can be locked and unlocked as often as desired upon any part of a bolt and which will operate equally as well upon a small-sized bolt as upon'one of a larger size.

The character and scope of the invention will be clearly apparent from a description, together with the claims appended thereto, of one particular embodiment, which is illus trated in the accompanying drawings.

in the drawings, Figure l is a plan view of a bolt and the improved nut-lock screwed thereon, but not locked to the bolt. Fig. 2 is a section taken practically on the line 2 2 of Fig. 1. Fig. 3 is a plan view of the improved nut lock and a transverse section through a bolt to which it is applied, the section being taken on the line 5 5 of Fig. 4, and in this view the key of the nut is shown in locking engagement with the bolt. Fig. 4 is a section taken practically on the line L 4L of Fig. 3. Fig. 5 an elevation. Fig. 6 is a view of a modification hereinafter described, and Fig. 7 is a detail perspective view of the key removed from the nut.

In the particular embodiment of my invention herein selected for illustration an ordinary nut is provided with a recess and a key having limited rocking and guiding move ment in the recess to and from the thread of the bolt to which the nut is fitted, one edge of the key, called the cutting edge, being adapted when the key is forcibly rocked in- Ward to enter the threads of the bolt passed through the nut and at the same time having a perfect bearing at its bottom edge forward of its fulcrum upon the bottom of the recess,

whereby when the key is in locking engagement with the bolt it can be readily, but forcibly, rocked outward, thus withdrawing the key from the threads of the bolt and causing the key to have lirm bearing rearward of its fulcrum upon the bottom of the said recess.

At the same time the forward upper portion of the key will be more or less elevated, so that it can be convenientlyforceddownwardly and forwardly when the nut is to be again applied to the bolt. The key, furthermore, may

be provided with a peeuliarly-shaped pivot or fulcrum adapted to lit a socket formed for the purpose in the bottom of the said recess,

these two said elements being so shaped as to permit the action of the key above referred Means, moreover, are provided whereby the key will be prevented from leaving its chamber and for holding the key in locking position.

A represents a belt of any suitable form, and B represents a nut which is adapted to the bolt, either of which may be of any suitable dimensions. The nut is provided with a recess 10, produced in what may be termed its outer face and formed in any suitable manner, as by milling through from the outer edge into the threaded bore of the nut, as is clearly shown in Figs. 1, 2, 3, and L. In the bottom of this recess 10 a socket 11 is formed near the longitudinal center of the said recess 10 and preferably nearer the inner or forward edge of said recess than the outer or rear edge thereof, as is shown in Figs. 2 and 4. This socket 11 is provided with a straight or perpendicular rear or outer wall and with an inner or forward wall more or less curved, as is shown in Figs. 2 and 4.

A key U of a thickness to permit free play toward and from the bolt is located in the said recess 10, the upper edge of the said key being preferably straight, but its outer or rear edge 12 being more or less downwardly and outwardly inclined, as is shown in Fig. 6. The forward or inner edge 13 of the said key is preferably made practically straight at its upper portion, but downwardly and rearwardly curved at its lower portion. The said key 0 at its forward or inner edge may be bev eled at its two side faces, so as to produce a central sharp cuttingedge 14; but it will be understood that, if desired, the forward edge of the said key C may be beveled upon one side only to produce the cutting edge 1%.

The bottom edge of the key is preferably provided near its forward or inner cutting edge A with a fulcrum member 19, extending transversely of the said bottom edge of the said key. This fulcrum member 19 is of the same general shape as the recess 11 in the bottom of the chamber 10, which recess 11 the said fulcrum member is adapted to enter, and said recess 11 is slightly larger in crosssection than the cross-section of the fulcrum member 19, so as to permit a free rocking motion of the said key in the said chamber 11.

The bottom edge of the key, furthermore, is inclined upwardly at 15 from the rear or straight side of the fulcrum member 19 to the outer or rear inclined edge 12, and the upper face 16 of the said key C is preferably straight, as is fully shown in Fig. 6. In the upper or straight face of the key recesses 17 are made in opposite sides, inclining from the outer side faces of the key upwardly in direction of a center line drawn longitudinally through the upper face 16 of the key, and also preferably at the forward or inner portion of the key smaller and usuallysemicircular recesses or indentations 1 8 are produced, which recesses or indentations 18 are opposite each other, as shown in Figs. 1, 3, and 6. hen the key has been placed in said chamber and the fulcrum member 19 has been entered into the recess 11 at the bottom of said chamber, the key is tilted backward or outward, as is shown in Figs. 1 and 2, whereupon the inclined surface at the rear of the pivot member 19 will rest flat upon the bottom wall of the chamber 10, and the forward upper portion of the cutting edge 14: of the key will be elevated beyond the outer face of the nut to a greater or less extent, as is also shownin Fig. 2, and the said cutting edge 14 of the key will at such time be removed some distance from the threaded bore of the nut. has been placed in the chamber 10 the walls of the said chamber at the outer face of the nut are struck with asuitable instrumentand made to spread out over the chamber, forming lips 20, which lips extend into the recesses 17 in the key C when the key is in looking engagement with the bolt,'as is shown in Fig. 3, and these lips 20 serve to prevent the key from leaving the chamber 10 and in no wise interfere with its rocking movement in the chamber. The recesses 17 are made so that when the key is carried to a locking connection with a bolt the outer face of the key may be practicall y flush with the corresponding face of the nut.

After a nut has been adjusted on the bolt and it is desired to lock the nut on the bolt an instrument-such as a punch, a nail,or the like-- After a key is employed and is brought in engagement with the outer face of the key at its cutting edge and is tapped to the bolt, whereupon the inner or forward cutting edge of the key is forced downward and forward and is made to enter the threads of the bolt, as is shown in Figs. 3 and 4, and at such time the lower face of the key forward of its fulcrum member 19 will have firm bearing on the bottom of the chamber 10. In order to insure the key remaining in this position, I form indentations 21 in the outer face of the nut opposite the recesses 18 in the key, and by placing a punch in the said recesses 21 and driving the punch with a quick blow, for example, lips 22 are formed by reason of the metal being crowded over the chamber 10, and these lips 22 will enter and engage with the walls of the recesses or indentations 18 in the key. hen it is desired to remove a nut from the bolt, it is accomplished by quickly and violently striking the outer face of the key at or near its outer or rear edge, and as the preponderance of length is at the rear of the fulcrum 19 such a blow will cause the forward or cutting edge of the key to rise and assume its normal position, and the lips 22 formed by the punching above described will be crowded back, at which time the nut may be readily unscrewed from the bolt. When the nut is again to be placed upon the bolt, the operation is repeated, and the metal which constituted the lips 20 and which was crowded back in the first operation of removing a nut from the bolt can be again forced into the said recesses or cavities 18.

As clearly indicated in Figs. 2, 4, 5, and 7, inclusive, the rear sliding face 12 of the key C is provided with depressions or recesses 23, corresponding in shape to the recess 22 upon the forward upper face of the key. The recesses 23 are intended when the key is in locking position, as shown in Fig. 4, to register with the recesses 24:, extending longitudinally of the key-holding recess and terminating substantially flush with the rear edge 12 of the key when in locking position. By this construction it is possible when owing to the juxtaposition of other objects it is impossible to strike a blow directly upon theupper face of the key to insert a tool between the said upper face and the adjacent object by a glanc ing blow upon the key to force the same to locking position, in which position it may be retained by inserting a suitable tool in the recess 24: and upset the metal at the bottom thereof over upon and within the recess 23, whereby the key will be firmly held.

NVhen it is desirable to maintain the edge of the nut intact and it is possible conveniently to reach the face of the nut when in position, the recess to receive the key may be formed in the shape of a chamber, as shown in the modification illustrated in Fig. 6.

Many changes may be made in the construction and relative arrangement of the parts without departing from the spirit and scope of my invention.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. In a nut-lock, the combination of a nut having a recess in one face communicating with the bore of the bolt, and a key having an edge sharpened and adapted to enter the bore of the nut, the key supported in the bottom of the recess and having a rocking motion thereon by means of a socket-and-fulcrum conneetion.

2. A nut-lock having a recess in one face communicating with the bore of the nut, the said recess being provided with a bottom socket, a key having a bottom fulcrum member which enters the socket in the recess, having rocking movement therein, and lockinglips at the mouth of the said recess, which extend over the key, as described.

A nut-lock having a recess in one face communicating with the bore of the nut, the said recess being provided with a bottom socket having a rear straight wall and a forward curved Wall, a key provided with a forward curved cutting edge, a beveled rear edge, a straight upper edge and a bottom edge inclined from the front upwardly and rearwardly, the said key being provided also with recesses in its upper side edges, a fulcrum member at the bottom of the key, adapted to enter the said socket in the said recess and conforming to the contour of the said socket, and locking-lips which extend from the mouth of the recess, in one position of the key being adapted to enter the side recesses in said key, substantially as described.

4. The combination with a nut having the usual threaded bore, the said nut being provided with a recess in communication with. the said threaded bore, the said recess being provided with a socketin its bottom face, located nearer the bore than the rear or outer end of the recess, which socket has a vertical rear wall and a curved forward wall, of a key adapted to rock in the said recess, which key is provided with a straight outer face and an upwardly and rcarwardly inclined inner or bottom face, a beveled rear face and a cutting edge at its forward portion, which cutting edge is straight where it connects with the outer face of the key but is curved upwardly and rcarwardly at its lower portion, and a fulcrum member at the bottom or inner edge of the said key, adjacent to the termination of the said forward cutting edge, which fulcrum member has a corresponding formation to that of the socket in the bottom or inner wall of the recess, which socket the said fulcrum member is adapted to enter, and lips extending from the side walls of said recess at its mouth, adapted to extend over the said key, which key at opposite sides is provided with recesses to receive the said lips in one position of the key.

5. In nut-locks, alocking-key therefor, provided with flat sides, a straight upper edge, a beveled outer or rear edge, a curved cutting forward edge, and a rear edge upwardly and rcarwardly inclined, the said upper edge of the key being provided with opposing side recesses, and a fulcrum member located at the bottom of the key adjacent to the forward or cutting edge, the rear or outer wall of which fulcrum member is straight and the forward or inner wall curved, as described.

In testimony whereof I have signed my name to this speeilication in the presence of two subscribing witnesses.

JOSEPH H. BURRO\VS.

\Vitnesses:

EDWIN E. S'ruvuNs, RALri-i' C. POWELL. 

